Just a reminder (for "fin fly" and "short approach" and others):
The 737 (like most multi-engine planes) has a very powerful rudder for yaw control with an engine failure, which can indeed turn a plane upside down and (via the inverted lift) point the nose at the ground very rapidly if activated unexpectedly.
Search the Web for "United 585" and "US Air 427" to find two fatal 737 crashes caused by a rapid roll brought on by uncommanded rudder deflection (in those cases, a mechanical glitch, rather than reaching for the wrong knob).